Flushing-gate for sewers, &amp;c.



UNITED STATES Patented March 21, 1905.

PATENT OFFICE- GEORGE S. WALKER, OF BOSTON, MASSACHUSETTS. ASSIGNOR TOCOFFlN VALVE COMPANY, OF BOSTON, MASSACHUSETTS, A CORPORATION OFMASSACHUSETTS.

FLUSHING-GATE FOR SEW'ERS, ac.

SPECIFICATION forming part 01 Letters Patent No. 785,134, dated. March21, 1905- Application filed January 9, 1905- Serial No. 240,325J

To (LZZ wit/rm, 7T1; may concern.-

Be it known that I, GEORGE SUTHERLAND WALKER, of Boston, in the countyof Suffolk and State of Massachusetts, have invented a new and usefulImprovement in Flushing- Gates for Sewers and for Like Purposes, ofwhich the following-is afull and exact description, reference being hadto the accompanying drawings and to the letters of reference marked Iothereon.

Figure 1 is aside elevation of the gate, showing the valve in a closedposition. Fig. 2 is a front or downstream elevation of the same.

The gate-frame is marked A, the valve is 5 marked B, and itsstrengthening ribs B.

The valve-hinges are marked C, and its leverarm C. The hinges arepivoted on the axial rod D, which is supported in lugs E upon the frame.The levers C are pivoted to the link F, the opposite end of which ispivoted to the bell-crank G at the end of arm G. The upper end or arm ofthese bell-cranks is extended in suitable form to carry counter orbalance weights I. There are two of these weights 5 shown in thedrawings, though a single one may be used, if preferred. Thecounterbalance-weight and levers may be omitted entirely in the case ofsmall gates when the valve can be easily operated without them. 3 Aset-screw J serves to secure the weights at any desired position uponthe lever-arm of the bell-crank. In the frame are shown holes around themargin for bolting it to a pipe or wall-pipe or to the masonry.

The yoke-lever L is pivoted at its middle to the valve B. Its outerextremities curve downward to grasp the lugs P on the frame by means ofthe holddown-lugs on the lever ends at O, the upper end being connectedto 4 the operating-rod N at N, so that when the operating-rod N ispushed down the valve is locked to its seat and when the rod is pulledup the lugs O and P disengage and the valve is free to be lifted. Thetilting of lever L by the upward lift of rod causes it to stop againstlug Q on the valve and become rigid in relation to the valve, so thatthe further lifting opens the valve. Its open position is indicated bydotted line 1, and the corresponding position of the counterweightlever-arm is indicated by the dotted line b. The bellcranks G arepivoted upon rod R, which is supported in lugs S on the frame A. Theoperating-rod N has lock notches or hooks and whenlifted may be made toengage with any suitable stop, as T in Fig. l, or U in Fig. 2.

The frame A has an opening for the flow bounded by the dotted lines a b0 (Z in Fig. 2 and e f in Fig. 1. This opening is opened and'closed bymeans of valve B. This valve is hinged at C D to the frame, as beforealluded to, and is provided with a suitable facing V, preferably ofbronze, and is well fitted to a similar facing W on the frame. Thesefaces are suitably inclined in relation to the flow of the sewageliquid. This direction is indicated by an arrow in Fig. 1.

The object to be accomplished is to secure by sudden flooding andforceful flow the more perfect removal or washing out of the stagnatedor accumulated sewage matter below the gate. To this end the gate isclosed, as described, for a time until there is accumulated some head ofreserved fluid above the gate. Then the gate is suddenly opened bypulling up rod N, which first disengages lugs O P, as described. Thenthe further sudden pull opens suddenly the valve, causing aforceful rushdownward through the gate of the accumulated liquid, so washing away theaccumulations acquired during the slower natural flow. The drawings showthe valve in its closed position locked securely by the engagement ofthe lever ends O with the lugs P on the frame. The lugsPhave an inclinedsurface underneath for lever end lugs O to slide upon, so as to tightenthe locking action.

The counterbalance-weights I and their connecting-levers may be omittedwhen the gate is a small one and easily operated by hand.

The parts may be made of the usual materials employed in the art orother materials applicable.

I claim- 1. The yoke-lever, having the upward arm for connection to thelifting-rod and the two lower arms provided with holddown-lugs and theintermediate fulcrum attachment to the valve, in combination with thehinged valve, its stop-lugs for the lower arms of the lever, thegate-frame and its incline lugs to engage the holddown ends of thelever, substantially as shown and described.

2. In combination with the'hinged valve, its arms and connecting-links,the pivoted bellcranks and adjustable balance-weights, arranged atcorresponding reversed angles, substantially as shown and described.

3. The adjustably-balanced flushing-gate, comprised of a frame having athrough fluidway and a hinged valve, the yoke-lever with central fulcrumjointed to the valve and arms embracing valve and frame, and lockingunder lugs provided with inclines upon the frame, an upward arm andjointed lifting-rod with the valve-arms, connecting-links, bellcranks,adjustable balance-weights, to which they are connected, all arrangedand acting together substantially as shown and described.

4. The combination of the gate-frame, its pivoted valve, the pivotedthree-arm lever, its engaging lugs, operating-rod, and lever-stops onvalve and frame, all arranged and operating together, substantially asshown and described and for the purpose set forth.

5. The three-arm lever and operating-rod in combination with the pivotedvalve, and valve frame, all constructed and arranged substantially asshown and described and for the purpose set forth.

, GEORGE S. \VALKER.

Witnesses:

F. E. ADAMS, D. N. B. OOFFIN, E. J. CHADBOURNE. v

